Enable CA cert download on Chart deployment
Enable CA cert download on Chart deployment

This commit fixes #5138.  A volume references the secret will be mounted
to the UI pod, so the user can download the CA cert from UI.

steven-zou/harbor,reasonerjt/harbor,steven-zou/harbor,wy65701436/harbor,wy65701436/harbor,reasonerjt/harbor,reasonerjt/harbor,wy65701436/harbor,reasonerjt/harbor,wy65701436/harbor,steven-zou/harbor,wy65701436/harbor,reasonerjt/harbor,wy65701436/harbor,steven-zou/harbor,steven-zou/harbor,reasonerjt/harbor,steven-zou/harbor